题目内容

【题目】化简下列各式

1a+[2a﹣2﹣4﹣2a]

2x﹣2x﹣y2+

33x2+[2x﹣﹣5x2+4x+2]﹣1

4﹣3ax2﹣ax+3﹣ax2ax﹣1

【答案】15a﹣6;(2y2﹣3x;(38x2﹣2x+1;(4ax+2

【解析】

试题分析:1)先去小括号,再去中括号,然后合并同类项即可;

2)先去括号,再合并同类项即可;

3)先去小括号,再去中括号,然后合并同类项即可;

4)先去括号,再合并同类项即可.

解:(1a+[2a﹣2﹣4﹣2a]

=a+[2a﹣2﹣4+2a]

=a+2a﹣2﹣4+2a

=5a﹣6

2x﹣2x﹣y2+

=x﹣2x+y2

=y2﹣3x

33x2+[2x﹣﹣5x2+4x+2]﹣1

=3x2+[2x+5x2﹣4x+2]﹣1

=3x2+2x+5x2﹣4x+2﹣1

=8x2﹣2x+1

4﹣3ax2﹣ax+3﹣ax2ax﹣1

=﹣ax2ax+1+ax2+ax+1

=ax+2

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